1True or false: a circle has two centres.
2True or false: the diameter of a circle passes through the centre.
3True or false: a line segment joining any two points on the circumference is called the radius.
4True or false: the region between two radii is called a sector.
5True or false: not all chords are diameters.
6True or false: a circle has only one diameter.
7True or false: the diameter of a circle is twice its radius.
8What is the centre of a circle? Make it clear with a labelled drawing.
9What is the circumference of a circle? Show it with a drawing.
10What is the difference between the diameter and the radius of a circle? Show it in a drawing.
11Define a sector of a circle.
12What is the difference between a diameter and a chord? Make it clear with a drawing.
13How many semi-circles are there in a circle? Show them in a drawing.
14In a circle with centre O, the line CD passes through O, the segment OE is drawn, and AB does not pass through O. Name each of these parts.
15How would you find the centre and the diameter of a round eating plate?
16The radius of a circle is 6.5 cm. What is its diameter?
17What happens if the arms of the compass open a little while you are drawing a circle, and why?
18A circle has a chord of 4 cm and a diameter of 10 cm. Can a chord of 12 cm be drawn in the same circle? Give your reason.
19How are a sector and a semi-circle related?
20A round table has a radius of 45 cm. What is the distance from one edge to the other edge measured through the centre?